<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <meta http-equiv="X-UA-Compatible" content="ie=edge">
  <title>Document</title>
  <style>
    body {
      transform-style: preserve-3d;
      perspective: 50px;
    }
    div{
      width: 100px;
      height: 100px;
      background: #000;
      transform: rotateX(45deg);
      margin: 0 auto;
    }
  
  </style>
</head>
<body>
  <div></div>
</body>
</html>